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Date: Fri, 16 Oct 2009 15:55:31 -0700 (PDT)
From: "Todd Lipcon (JIRA)" <jira@apache.org>
To: mapreduce-dev@hadoop.apache.org
Subject: [jira] Created: (MAPREDUCE-1119) When tasks fail to report status,
 show tasks's stack dump before killing
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When tasks fail to report status, show tasks's stack dump before killing
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                 Key: MAPREDUCE-1119
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1119
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: tasktracker
    Affects Versions: 0.22.0
            Reporter: Todd Lipcon


When the TT kills tasks that haven't reported status, it should somehow gather a stack dump for the task. This could be done either by sending a SIGQUIT (so the dump ends up in stdout) or perhaps something like JDI to gather the stack directly from Java. This may be somewhat tricky since the child may be running as another user (so the SIGQUIT would have to go through LinuxTaskController). This feature would make debugging these kinds of failures much easier, especially if we could somehow get it into the TaskDiagnostic message

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